Portable derrick mast



June 18, 1940. w. B. WOODY PORTABLE DERRICK MAST Filed March 5, 1938 3 Sheets-Sheet 1 @m uuu 7 2 I .1 i r J Ll l l ".V l l l l l I I I l i l I I I I l l l l l l l l Bub. 1 o

II o o INVENTOR W. B. -WO Y BY ATTORNEY June 18, 1940. w. B WOODY 2,204,716

PORTABLE DERRICK MAST Filed March 5,1958 5 Sheets-Sheet s INVENTOR w. a. WOODY ATTORNEY Patented June 18 1940 7 I UNITED "STATES PATENT orriea PORTABLE DERRICK MAST Wayland B. Woody, Tulsa, Okla., assignor .to Franks Manufacturing Corporation, Tulsa, Okla., a corporation of Oklahoma Application March 5, 1938, Serial No. 194,155 3 Claims. (Cl. 189-11 This invention relates to drilling apparatus support for the mast whereby the latter may be and particularly to improvements in means for swung in a vertical direction in transport or. raising and lowering a derrick mast of a portdrilling position. An upright support member I able drilling apparatus designed particularly for located near the forward end of frame 2 serves 5 use in oil well drilling. to support the upper portion of the mast when 5 An object of this invention is to provide imin transport position. proved means for raising and lowering the der- A second rigid horizontal cylindrical bar 8 exrick mast of a portable type drill. tends transversely across the lower extremity of Another object is to provide improved means the mast, and is secured to the side frames there-- 10 for raising and lowering the derrick mast of a of. When the mast is in upright position, bar 10 portable drill mounted on an automobile. Q will be below the level of frame 2. A tubular These and other objects will become apparent sleeve 9 encloses bar 8 and serves as a rotative from the following detailed description when connection to the mast hoisting mechanism to be read in conjunction with the accompanying later described.

l5 drawings which illustrate one form of apparatus v Frame 2 is constructed of H-beams side mem- 5 in accordance with this invention. hers ill connected together by cross members,

In the drawings: 7 such as beams it, as shown in Fig. 3 particu- Fig. 1 is a side elevation showing an automolarly. bile truck having mounted thereon a derrick mast The outer flanges of H-beams ill enclose a and apparatus in accordance with this invention channel it in which is mounted a cross-head 2 for raising and lowering the mast between drill- M which is adapted to be moved longitudinally ing position, shown in solid lines, and transport of channel it toward and away from the rear position, shown in dotted lines. end of. frame 2. Angles iron member's i5-l5 are Fig. 2 is a plan view of the principal portions attached to the flanges of the H -beams so as to of the structure shown in Fig. l. practically enclose the rearward end portions. 5

Fig. 3 is a rear end elevation of the mast strucof channel it and form guide rails for crossture and the raising means therefor. head it to retain same in the channel. Cross- Fig. 4 is an enlarged side view of some of the head it is preferably mounted on rollers ii6 details of the mast raising apparatus, some of to reduce friction when the cross-head is recip the parts being broken away for purposes of -rocated in channel iii. 30 illustration. A short shaft it is journalled in cross-head it Fig.5 is a detail of a cross-head element formand a rigid pitman it has one end connected to ing a part of the mast raising mechanism. shaft ill and-the other to tubular sleeve 9. By

Fig. 6 is a sectional elevation taken along line this arrangement, movement of cross-head it to- 6-6 of Fig. 5. ward the rear end of frame 2 to the position 5 Fig. '7 is a. lonigtudinal section of a detail of shown in dotted outline in Fig. 1 will act through the mast raising apparatus, and pitman it to move the lower extremity of mast l I Fig. 8 is atransverse sectional View taken along outwardly and upwardly and cause the mast to line 8--8 of Fig. 'l. swing toward its transport position about the 40 Referring to the drawings, a derrick mast i horizontal pivot formed by bar t in bearings is shown mounted on a frame, designated gen- 55. Movement of the cross-head in the oppoerally by the numeral 2. Mast I and frame 2 are site direction will act through pitman it to in turn mounted on a transporting vehicle, such pull the mast baclr to the vertical position. as an automobile truck 3. t Cross-head i4 is reciprocated in channel i3 The derrick mast I, preferably, is of fabriby means ofa power operated screw l9, which 45 cated tubular construction built up of tubes weldis mounted in channel l3 forwardly of frame 2. ed together in the desired form and rigidly The rearward end of screw iii is connected to the braced. A rigid horizontal cylindrical bar l, seadjacent end of cross-head M by connection 20 cured at its ends to the side frames of the mast, which permits the cross-head, to be reciprocat- 0 extends transversely across the mast at a level ingly moved in accordance with the longitudinal above that of frame 2 and is mounted in a pair movements of the screw. of sleeve bearings 5-5 secured to the upper ends Screw I9 threadedly engages a nut member of respective upright members 66 rigidly 2| which is fixed against longitudinal movement mounted on one of the cross members of frame 2. relative to screw l9 and frame 2 by mounting in Bar 4 in its bearings forms a horizontal pivotal a bearing box 22 fixedly attached to the web of 55 H-beam l0. vThe forward end of nut member 2| is provided with a hollow splineconnection 23 which engages a complementary splinei'fl'mounted on the rearward end of a hollow shaft 25,the bore of which is in registration with screw 19. Shaft "25 is mounted-longitudinally inchannel i3 forwardly of bearing box 22 and is journalled in bearings 26 and 21 attached to H-beam-lfl. A sprocket 28 is rigidly mounted on shaft 25 and connected by a drive chain 29 to a drive shaft 30 which is in turn driven from the transmission 3| of, the truck. I

By this arrangement of drive mechanism, hollow shaft 25 if rotatively driven from the power transmission of the truck and by means of the 1 her 2l-, "which, by its threaded engagement with screwlfl' reciprocates cross head H in a direction depending upon the direction 'of rotation of hollow shaft 25.

When cross-head I4 is moved forwardly of the frame to bring mast I into operating position, screw l9 will telescope in hollow shaft 25 andthus will be protected from the sand and'm'ud usually present during drilling operations I f The manner of mounting the mast elevating ,mechanism in the frame channels willalso protect 'the'mechanism' from the hazards of road shock when the apparatus is being moved and;

from injury by objects falling from the mast or other drilling equipment.

By pivotally connecting pitman Hi to the lower extremity of mast I and by driving the cross-- other parts of the drilling mechanism not shown,

but conventionally mounted on frame 2,?and will provide advantages in space saving and compactness which is highly important in. the unitized forms of drilling rigs, which are-ordinarily mounted on transporting vehicles.

While-only one side of the mast elevating mechanism. has been described above, it will be. ap parent from the drawings that duplicate mech I anisms are used, one'being mounted pneach side of the frame, to increase the safetyffactor and 1 to more uniformly distribute the ma'st swingin'gload. I

It will be understood that various modifications and alterations may be made in the size, form and arrangement of the details of the device of .this invention, all without departing from. the-f scope of the appended claims.

Patent is:

1. In a portable derrick mast structure, a mobile base, a frame on said base including horizontally spaced parallel side members having 1ongitudinal guide members extending outwardly therefrom, a derrick mast pivotally mounted on said frame adjacent its rearward end and movable relative thereto between transport and vertical operating positions, means for pivotally moving said derrick mast, said means comprising a cross head member slidably mounted in one of said guide members and constrained thereby to move longitudinally of said frame, a rigid crank member having one end journaled in said cross head member and the other end rotatively attached to the lower extremity of said derrick mast, and means mounted within said guidemembers for moving said cross head member longitudinally thereof.

2. In a portable derrick mast structure, a mobile base', a frame on said base including horizontally spaced parallel side members having longitudinal channels therein opening outwardly" of said frame, a derrick mast pivotally mounted :on said frame adjacent its rearward end, and

movable relative thereto between transport and vertical operating positions, means for pivotally -moving said derrick mast, said means compris- 3. In a portable derrick mast structure, a inc-- bile base, a frame on said base including horizontally spaced. parallel side members having longitudinal channels therein opening outwardly of saidframe, a derrick mast pivotally mounted 'onsaid frame adjacent its rearward end, and

movable relative thereto between transport and, vertical operating positions about a horizontal axis positioned above said frame, the lower 'exandfpojwer operated means for swinging-said derlrickmast aboutv said aXiasaid means comprisn'g, .a crosshead'member slidably' mounted in @391 of :said-channelsand movable therein longitudinally of saidframe, a pair of rigid crank members each having one end joumalled in one I of said cross head members and the other end rotatively attached to said lower. extremity of "said derrick mast, and power operated screw '45 'tremity of said derrick mast when same is in f vertical-operating position being below said frame,

means mounted within each of said channels for movingsaid cross head members longitudinally thereof. a

' WAYLAND B. WOODY. 

